Do it Wiser High Yield Compatible Black Toner Cartridge for Oki Okidata B411d B411dn B431d B431dn MB461 MB471 MF491-44574901 - 10,000 Pages Compatible with part number: 44574901 Compatible with printers Oki Okidata B411d B411dn B431d B431dn MB461 MB471 MF491 Our Do It Wiser smart toner cartridges are covered by a 1 year warranty against defects Cartridges certified to work | ISO 9001 quality assurance | ISO 14001 environmental management | RoHS Lead Free Estimated page yield: 10000 pages (depends on printer and usage)